EP1446248A1 - Device and method for flaring and shaping can bodies - Google Patents

Device and method for flaring and shaping can bodies

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Publication number
EP1446248A1
EP1446248A1 EP02779199A EP02779199A EP1446248A1 EP 1446248 A1 EP1446248 A1 EP 1446248A1 EP 02779199 A EP02779199 A EP 02779199A EP 02779199 A EP02779199 A EP 02779199A EP 1446248 A1 EP1446248 A1 EP 1446248A1
Authority
EP
European Patent Office
Prior art keywords
mandrel
shaping
frame
tool
bodies
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02779199A
Other languages
German (de)
French (fr)
Other versions
EP1446248B1 (en
Inventor
Norbert Lentz
Steffen RÖTZ
Jan Riemenschneider
Karl-Heinz Witt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cantec & Co KG GmbH
Original Assignee
SIG Cantec GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Application filed by SIG Cantec GmbH and Co KG filed Critical SIG Cantec GmbH and Co KG
Publication of EP1446248A1 publication Critical patent/EP1446248A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2646—Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing

Definitions

  • the invention relates to a device for expanding and shaping can bodies, with a mandrel-like molding tool that can be inserted into the can body to be expanded from one side, and a counter tool.
  • the invention further relates to a method for expanding and shaping can bodies, in which a mandrel-like molding tool is inserted into a can body and moved against a counter tool.
  • This device has a hard and massive, block made of steel or any other harder material, cylinder-like cross-section, which along most of its height has a larger diameter corresponding to the inner diameter of the already expanded can body and a conical section on its upper part. A short section of reduced diameter is arranged above this conical section and corresponds to the inside diameter of the can body to be expanded.
  • the shaping block should be designed in such a way that it can be attached or accommodated to the can body to be expanded under pressure and adaptable.
  • the molding block may also have at its lower end its tool for forming a flange in the form of a steel disc, which is provided on its upper side with an annular groove trough-shaped cross section, which extends from the lower end of the cylindrical can body during expansion and shaping can be achieved and engaged.
  • the counter tool is used according to DE 100 40 173 AI to form a flange on the upper part of a can and also consists of a steel disc, which is provided on its lower, the molding block side with an annular groove trough-shaped cross-section and a small annular and projecting portion surrounding the inner periphery of the groove.
  • the protruding portion is engageably held at the top of the can body to be subjected to the expansion and molding process.
  • the can body By inserting the molding block into a prefabricated can body, the can body is formed on the outer surface of the molding block, the can body diameter being enlarged and a so-called "neck-in" being formed in a single processing step.
  • the mentioned grooves of the two steel disks slightly expand the respective can body end faces.
  • the can body shape corresponds to its outer jacket contour, ie the can body is cylindrical except for a slight upper area, the neck-in area.
  • a tool suitable for this purpose consists of a plurality of segments arranged in a circle, which carry the desired shape profile on the outside. If you insert the tool into the welded cylinder and move the mold segments radially outwards by means of a cone inside the tool, they widen and form the cylinder body.
  • the disadvantage of this method is that the cylinder body becomes polygonal and that the cylinder body material is locally stretched to a great extent, the frame shortening is uneven over the circumference and the expansion cannot be carried out to the end of the frame, because then there is no longer a sufficiently precise flange.
  • the embossing of shape designs can also be carried out with the so-called spin-flow shaping, which is a roll-print process that does not widen, but rather reduces the diameter of the welding frame at the shaping point. With this method, however, only simple rotationally symmetrical shapes can be produced.
  • the finished frame, the can body is produced with a diameter which is less than or equal to the smallest desired diameter of the finished part.
  • a first embodiment worked with two mandrel-like molds, which are inserted into the can frame on the opposite sides and deform the can frame by expansion and shaping until the respective end faces of the mandrel-like molds come to the end position.
  • the cross-sectional profiles of the two mandrel-like shaping tools are at least at their ends in partial areas a smaller distance from the longitudinal axis of the can than the corresponding partial areas further away from the mandrel end.
  • the mandrel ends have a maximum diameter which is smaller, the same or slightly larger than the diameter of the can body to be expanded.
  • the cross-sectional shape can taper towards the end of the mandrel at least over a partially axial region.
  • the end faces of the mandrel can be arranged or formed either perpendicular to the longitudinal axis of the mandrel, at an oblique angle, in a corrugated manner or in any other shape to the longitudinal axis of the mandrel. The latter also allows constrictions on the can frame to be formed which lie at an oblique angle, undulating or in any other shape with respect to the longitudinal axis of the frame.
  • the present invention also relates to a method using the mandrel-like molds described.
  • Fig. 1 is a schematic illustration of two mandrel-like
  • Molding tools that pass through are remotely movable, shown in the starting position before the frame deformation,
  • FIG. 2 shows a corresponding arrangement according to FIG. 1 with can forming tools which are moved towards one another over a partial stroke and
  • Fig. 3 shows the end position of the molds, in which the
  • Fig. 4 is a side view of the with a tool
  • Fig. 1 to 3 made frame profile
  • Fig. 10 shows a difference-widened, stackable frame with a rotationally symmetrical decorative shape.
  • the frame is welded to the smallest diameter of the shape profile or somewhat smaller and then brought to the final diameter outside the shape profile by inserting a molding tool on both sides or in special cases.
  • the shape of the mandrel ends and the mandrel determines the shape profile and the shell geometry. If, depending on the desired shape, the respective mandrel end is slightly larger or equal to the inside diameter of the welded frame, the can end should be lightly butted in an upstream forming step so that the mandrel can be inserted automatically. As can be seen in Fig.
  • two mandrel-like molds 1 and 2 which can be carried out through an opening of mutually opposite scrapers 3 and 4, serve as molds for the can frame 5, the ends of which are slightly conically bent, so that the mandrel ends of the Molds 1 and 2 can be easily inserted.
  • the open frame 5 is arranged in a manner known from the prior art between the wipers 3 and 4 by means of a conveyor, not shown, and is positioned relative to the longitudinal tool axis 6, which is also the longitudinal axis of the frame. In the state shown in FIG. 1, the mandrel-like molds 1 and 2 are in the upper and lower dead positions, respectively.
  • the molds 1 and 2 are moved towards one another in the direction of the arrows 7 and 8, respectively, and they widen the can frame 5 until the final state shown in FIG. 3 is reached.
  • the profile of the molds has been molded in a corresponding manner onto the can frame 5, which has a throat-like constriction 9 in its lower third, which is determined by the tapered profiles of the ends of the mandrel-like molds.
  • the end faces of the molding tools come to face contact in the final state shown in FIG. 3.
  • the molds 1 and 2 can be withdrawn again, the shaped frame remaining between the wipers 3 and 4 and then being conveyed away using transport means known in the art.
  • Fig. 5 shows a widened frame 10 with a shape as a protective bead 11, which can be formed by the fact that the mold inserted from below is guided almost to the other end of the frame opening and the mandrel-like mold is designed to be correspondingly shorter as a counter tool. In this case too, the end faces of the mandrel-like shaping tools that finally come to rest are aligned perpendicular to the longitudinal axis 6.
  • the constriction 13 as an annular profile, is not orthogonal to the longitudinal axis 6, but rather at an oblique angle or it is undulating. This is achieved by using two mandrel-like shaping tools with correspondingly configured mandrel ends, the end face of which is arranged in a plane lying at an oblique angle or undulating to the longitudinal axis 6 or in an obliquely angled, possibly curved surface. Since only widenings can be impressed into the can frame with the molding tools according to the invention, that is to say no undercuts, the conically tapering mandrel ends are to be designed in accordance with the desired shape of the constriction and its position.
  • the frame 14 shown in FIG. 7 is also asymmetrical and has two non-linear regions 15 and 16, in which it tapers to a smaller diameter, which in the intermediate region 17 extends through a certain one the mandrel end design given length dimension is constant.
  • the shape and position of the shape can generally be adapted to the printed image.
  • a rotationally symmetrical decorative shape and longitudinal profiles 19 can be seen, which are determined by the outer shell of the mold.
  • Two mandrel-like shaping tools can be used to produce this can body, the end faces of which come to the final deformation position in plane 20 within the can body.
  • a correspondingly enlarged configuration of the molding tool inserted from below can also create a lower shoulder 22 with an enlarged diameter, which can be the same or a different diameter as the upper cylindrical shoulder 23 of the frame.
  • the can frame 24 has an outer casing which, with the exception of small upper and lower sections 25, 26 with a cylindrical shape, extends in each case to the plane 27 and tapers, i.e. the can casing outer profile is largely concave.
  • FIG. 10 shows that two can bodies 5 according to FIG. 4 can also be stacked; The same applies to the other can frames.
  • the flared frame is circular with a corresponding mandrel design - apart from molded longitudinal profiles - and not necessarily polygonal.
  • the expansion of the sheet is uniform over the circumference, which allows a larger expansion with the same sheet elongation. There are no striking fluctuations in height. Formability is possible up to the end of the frame.
  • a desirably uniform reduction in sheet thickness occurs in the cylindrical part, while the original sheet thickness is retained in the shape-sensitive area.
  • the molds used are simple, robust and easy to retrofit or replace in existing systems if changed shape shapes are required.
  • the shape designs shown in the exemplary embodiments according to FIGS. 1 to 10 can be varied as desired, with deformation limits being small, apart from the general suitability of the sheet and the lacquer. As already mentioned, only undercut shapes cannot be created.

Abstract

The widening and shaping device has a mandrel-like shaping tool (1) to go in the can body (5) from one side, and a counter-tool (2), also a shaping tool, to go into it from the other side. The cross-section profiles of the two shaping tools are identical or complementary. The tools have spacing from the mandrel axis (9) at one or both ends, at least in part regions.

Description

Beschreibung description
Vorrichtung und Verfahren zum Aufweiten und Formen von DosenrümpfenDevice and method for expanding and shaping can bodies
Die Erfindung betrifft eine Vorrichtung zum Aufweiten und Formen von Dosenrümpfen, mit einem dornartigen Formwerkzeug, das in den aufzuweitenden Dosenrumpf von einer Seite her einführbar ist, und einem Gegenwerkzeug.The invention relates to a device for expanding and shaping can bodies, with a mandrel-like molding tool that can be inserted into the can body to be expanded from one side, and a counter tool.
Die Erfindung betrifft ferner ein Verfahren zum Aufweiten und Formen von Dosenrümpfen, bei dem ein dornartiges Formwerkzeug in einen Dosenrumpf eingeführt und gegen ein Gegenwerkzeug bewegt wird.The invention further relates to a method for expanding and shaping can bodies, in which a mandrel-like molding tool is inserted into a can body and moved against a counter tool.
Eine derartige Vorrichtung sowie deren Verwendung sind in der DE 100 40 173 AI beschrieben. Diese Vorrichtung besitzt einen harten und massigen, aus Stahl oder irgendeinem anderen härteren Material bestehenden Formungsblock zylinderartigen Querschnittes, der entlang des größten Teiles seiner Höhe einen dem Innendurchmesser des bereits aufgeweiteten Dosenkörpers entsprechenden größeren Durchmessers und an seinem oberen Teil einen konischen Abschnitt aufweist. Über diesem konischen Abschnitt ist ein kurzer Abschnitt verringerten Durchmessers angeordnet, der dem Innendurchmesser des aufzuweitenden Dosenkörpers entspricht. Der Formungsblock soll derart ausgelegt sein, daß der unter Druck und anpaßbar an dem aufzuweitenden Dosenkörper angesetzt werden oder ihn aufnehmen kann. Der Formungsblock kann ferner an seinem unteren Ende sein Werkzeug zur Bildung eines Flansches in Form einer Stahlscheibe besitzen, die an ihrer oberen Seite mit einer ringförmigen Nut rinnenförmigen Querschnittes versehen ist, die von dem unteren Ende des zylindrischen Dosenkörpers während des Aufweitens und Formens erreicht und in Eingriff genommen werden kann. Das Gegenwerkzeug wird nach der DE 100 40 173 AI zur Formung eines Flansches an dem oberen Teil einer Dose verwendet und besteht ebenfalls aus einer Stahlscheibe, die an ihrer unteren, dem Formungsblock zugewandten Seite mit einer ringförmigen Nut rinnenförmigen Querschnittes versehen ist und einen kleinen ringförmigen und vorspringenden Abschnitt aufweist, der dem Innenumfang der Nut umgibt. Der vorspringende Abschnitt ist durch Ineingriffnahme anpaßbar an dem oberen Ende des den Vorgang des Aufweitens und Formens zu unterziehenden Dosenkörpers gehalten. Indem der Formungsblock in einen vorgefertigten Dosenrumpf eingeführt wird, formt sich der Dosenkörper an der äußeren Oberfläche des Formungsblockes an, wobei der Dosenkör- perdurchmesser vergrößert wird und in einem einzigen Bearbeitungsschritt ein sogenannter "Neck-in" gebildet wird. Die erwähnten Nuten der beiden Stahlscheiben weiten die jeweiligen Dosenzargenendflachen geringfügig auf. Die Dosenrumpfform entspricht somit nach dem erfolgten vollständigen Vortrieb des Formkörpers dessen Außenmantelkontur, d.h., der Dosenrumpf ist bis auf einen geringfügigen oberen Bereich, dem Neck-in- Bereich, zylinderförmig.Such a device and its use are described in DE 100 40 173 AI. This device has a hard and massive, block made of steel or any other harder material, cylinder-like cross-section, which along most of its height has a larger diameter corresponding to the inner diameter of the already expanded can body and a conical section on its upper part. A short section of reduced diameter is arranged above this conical section and corresponds to the inside diameter of the can body to be expanded. The shaping block should be designed in such a way that it can be attached or accommodated to the can body to be expanded under pressure and adaptable. The molding block may also have at its lower end its tool for forming a flange in the form of a steel disc, which is provided on its upper side with an annular groove trough-shaped cross section, which extends from the lower end of the cylindrical can body during expansion and shaping can be achieved and engaged. The counter tool is used according to DE 100 40 173 AI to form a flange on the upper part of a can and also consists of a steel disc, which is provided on its lower, the molding block side with an annular groove trough-shaped cross-section and a small annular and projecting portion surrounding the inner periphery of the groove. The protruding portion is engageably held at the top of the can body to be subjected to the expansion and molding process. By inserting the molding block into a prefabricated can body, the can body is formed on the outer surface of the molding block, the can body diameter being enlarged and a so-called "neck-in" being formed in a single processing step. The mentioned grooves of the two steel disks slightly expand the respective can body end faces. After the shaped body has been fully propelled, the can body shape corresponds to its outer jacket contour, ie the can body is cylindrical except for a slight upper area, the neck-in area.
Um sich von Wettbewerbern abzusetzen, werden von den Abfüllbetrieben zunehmend individuell geformte Dosen verlangt. Das zur Zeit gängigste Verfahren zum Formen von Zylinderrümpfen ist das mechanische Expandieren oder Spreizen. Ein hierzu geeignetes Werkzeug besteht aus einer Vielzahl von im Kreis angeordneten Segmenten, die auf der Außenseite das gewünschte Formprofil tragen. Führt man das Werkzeug in den geschweißten Zylinder ein und bewegt man mittels eines Konus im Inneren des Werkzeuges die Formsegmente radial nach außen, so weiten und formen diese den Zylinderrumpf. Der Nachteil bei diesem Verfahren liegt darin, daß der Zylinderrumpf vieleckig wird und daß das Zylinderrumpfmaterial lokal stark gestreckt wird, die Zargenverkürzung über den Umfang ungleichmäßig ist und die Aufweitung nicht bis zum Zargenende durchgeführt werden kann, weil dann kein ausreichender präziser Bördel mehr entsteht.In order to set themselves apart from competitors, bottling companies are increasingly demanding individually shaped cans. The most common method of forming cylinder hulls at the moment is mechanical expansion or spreading. A tool suitable for this purpose consists of a plurality of segments arranged in a circle, which carry the desired shape profile on the outside. If you insert the tool into the welded cylinder and move the mold segments radially outwards by means of a cone inside the tool, they widen and form the cylinder body. The disadvantage of this method is that the cylinder body becomes polygonal and that the cylinder body material is locally stretched to a great extent, the frame shortening is uneven over the circumference and the expansion cannot be carried out to the end of the frame, because then there is no longer a sufficiently precise flange.
Andere Verfahren arbeiten mit einer formgebenden Hohlmatrize, in die die Zarge hineingeformt wird. Als Druckmedium dient hochkomprimierte Luft oder ein Wasserstrahl. Allerdings sind solche Verfahren teuer, langsam und unflexibel.Other processes work with a shaping hollow die into which the frame is molded. Highly compressed air or a water jet is used as the pressure medium. However, such procedures are expensive, slow and inflexible.
Das Einprägen von Formgestaltungen kann auch mit dem sogenannten Spin-flow Shapen durchgeführt werden, bei dem es sich um ein Roll-Druck-Verfahren handelt, bei dem nicht aufgeweitet, sondern der Durchmesser der Schweißzarge an der Formgebungs- stelle reduziert wird. Mit diesem Verfahren können jedoch nur einfache rotationssymmetrische Formen erzeugt werden.The embossing of shape designs can also be carried out with the so-called spin-flow shaping, which is a roll-print process that does not widen, but rather reduces the diameter of the welding frame at the shaping point. With this method, however, only simple rotationally symmetrical shapes can be produced.
Ausgehend von dem vorgenannten Stand der Technik ist es Aufgabe der vorliegenden Erfindung eine Vorrichtung sowie ein Verfahren der eingangs genannten Art zu schaffen, mit dem preiswert, flexibel und mit schneller Umstellmöglichkeit gewünschte Dosenrumpfformen, einschließlich nicht rotationssymmetrischer Formen herstellbar sind. Die hierzu verwendeten Maschinenteile sollen möglichst robust sein und Umformungen bis zum Zargenende ermöglichen.On the basis of the aforementioned prior art, it is the object of the present invention to provide a device and a method of the type mentioned at the outset with which inexpensive, flexible and quickly convertible can body shapes, including non-rotationally symmetrical shapes, can be produced. The machine parts used for this purpose should be as robust as possible and allow forming up to the end of the frame.
Diese Aufgabe wird durch die Vorrichtung nach Anspruch 1 bzw. 7 sowie durch das Verfahren nach Anspruch 9 gelöst .This object is achieved by the device according to claims 1 and 7 and by the method according to claim 9.
Erfindungsgemäß wird die fertiggestellte Zarge, der Dosenrumpf, mit einem Durchmesser hergestellt, der kleiner oder gleich dem kleinsten gewünschten Durchmesser des Fertigteiles ist. Im Unterschied zum Stand der Technik wird jedoch nach einer ersten Ausführungsvariante mit zwei dornartigen Formwerkzeugen gearbeitet, die auf den gegenüberliegenden Seiten her in die Dosenzarge eingeführt werden und die Dosenzarge durch Aufweitung und Formgebung umformen, bis die jeweiligen Stirnseiten der dornartigen Formwerkzeuge zur Endlage kommen. Die Querschnittsprofile der beiden dornartigen Formwerkzeuge haben zumindest an ihrem Ende in Teilbereichen einen von der Dosenlängsachse geringeren Abstand als die von dem Dornende weiter abliegenden entsprechenden Teilbereiche. Dies können dornendseitig konische oder tangential ineinander übergehende Verrundungen oder eine Kombination aus beiden, aber auch außenmantelseitig unrunde Querschnittsprofile oder eine Kombination aus beiden sein. Die Dornenden besitzen einen maximalen Durchmesser, der kleiner, gleich oder geringfügig größer als der Durchmesser des aufzuweitenden Dosenrumpfes ist. Insbesondere kann die Querschnittsform zum Dornende hin zumindest über einen teilaxialen Bereich verjüngend ausgebildet sein. Die Dornstirnflächen können entweder senkrecht zur Dornlängsachse, schrägwinkelig, wellenförmig oder anderweitig beliebig geformt zur Dornlängsachse angeordnet bzw. ausgebildet sein. Letzteres läßt auch Einschnürungen an der Dosenzarge ausformen, die schrägwinkelig, wellenförmig oder anderweitig beliebig geformt zur Zargenlängsachse liegen.According to the invention, the finished frame, the can body, is produced with a diameter which is less than or equal to the smallest desired diameter of the finished part. In contrast to the prior art, however a first embodiment worked with two mandrel-like molds, which are inserted into the can frame on the opposite sides and deform the can frame by expansion and shaping until the respective end faces of the mandrel-like molds come to the end position. The cross-sectional profiles of the two mandrel-like shaping tools are at least at their ends in partial areas a smaller distance from the longitudinal axis of the can than the corresponding partial areas further away from the mandrel end. These can be conical roundings on the mandrel end or tangential merging or a combination of both, but also non-round cross-sectional profiles on the outer jacket side or a combination of both. The mandrel ends have a maximum diameter which is smaller, the same or slightly larger than the diameter of the can body to be expanded. In particular, the cross-sectional shape can taper towards the end of the mandrel at least over a partially axial region. The end faces of the mandrel can be arranged or formed either perpendicular to the longitudinal axis of the mandrel, at an oblique angle, in a corrugated manner or in any other shape to the longitudinal axis of the mandrel. The latter also allows constrictions on the can frame to be formed which lie at an oblique angle, undulating or in any other shape with respect to the longitudinal axis of the frame.
Gegenstand der vorliegenden Erfindung ist auch ein Verfahren unter Verwendung der dornartigen beschriebenen Formwerkzeuge.The present invention also relates to a method using the mandrel-like molds described.
Weitere Ausgestaltungen der Erfindung sowie Vorteile werden anhand der Zeichnungen erläutert. Es zeigenFurther refinements of the invention and advantages are explained on the basis of the drawings. Show it
Fig. 1 eine schematische Abbildung zweier dornartigerFig. 1 is a schematic illustration of two mandrel-like
Formwerkzeuge, die durch Öffnungen von Abstrei- fern gegeneinander bewegbar sind, dargestellt in der Ausgangsstellung vor der Zargenverformung,Molding tools that pass through are remotely movable, shown in the starting position before the frame deformation,
Fig. 2 eine entsprechende Anordnung gemäß Fig. 1 mit über einen Teilhub aufeinander zu bewegten Dosenformwerkzeugen undFIG. 2 shows a corresponding arrangement according to FIG. 1 with can forming tools which are moved towards one another over a partial stroke and
Fig. 3 die Endstellung der Formwerkzeuge, in der dasFig. 3 shows the end position of the molds, in which the
Dosenrumpfprofil fertiggestellt ist,Can body profile is completed,
Fig. 4 eine Seitenansicht des mit einem Werkzeug nachFig. 4 is a side view of the with a tool
Fig. 1 bis 3 hergestellten Zargen-Profiles undFig. 1 to 3 made frame profile and
Fig. 5 bis 9 jeweilige Ausgestaltungsmöglichkeiten für die5 to 9 respective design options for the
Dosenzarge, sowieCan frame, as well
Fig. 10 eine differenzaufgeweitete, stapelbare Zarge mit einem rotationssymmetrischen Dekorations- Shape .Fig. 10 shows a difference-widened, stackable frame with a rotationally symmetrical decorative shape.
Wie bereits erwähnt, wird die Zarge auf den kleinsten Durchmesser des Shapeprofiles oder etwas kleiner geschweißt und dann durch beidseitiges bzw. in Sonderfällen einseitiges Einschieben eines Formwerkzeuges auf den Enddurchmesser außerhalb des Shapeprofiles gebracht. Die Ausgestaltung der Dornenden und des Dorns bestimmt das Shapeprofil und die Mantelgeometrie. Falls je nach gewünschter Shapeform das jeweilige Dornende etwas größer oder gleich dem Innendurchmesser der geschweißten Zarge ist, sollte das Dosenende in einem vorgelagerten Umformschritt leicht konifiziert werden, damit der Dorn automatisch eingeführt werden kann. Wie in Fig. 1 ersichtlich, dienen zwei dornartige Formwerkzeuge 1 und 2, die durch eine Öffnung von sich im Abstand gegenüberliegenden Abstreifern 3 und 4 durchführbar sind, als Formwerkzeuge für die Dosenzarge 5, deren Enden leicht konisch aufgebogen sind, so daß die Dornenden der Formwerkzeuge 1 und 2 leicht eingeführt werden können. Die offene Zarge 5 wird mittels nicht dargestellter Fördermittel in nach dem Stand der Technik bekannter Weise zwischen den Abstreifern 3 und 4 angeordnet und zur Werkzeuglängsachse 6, die gleichzeitig Zargenlängsachse ist, positioniert. In dem in Fig. 1 dargestellten Zustand befinden sich die dornartigen Formwerkzeuge 1 und 2 in der jeweils oberen bzw. unteren Totlage.As already mentioned, the frame is welded to the smallest diameter of the shape profile or somewhat smaller and then brought to the final diameter outside the shape profile by inserting a molding tool on both sides or in special cases. The shape of the mandrel ends and the mandrel determines the shape profile and the shell geometry. If, depending on the desired shape, the respective mandrel end is slightly larger or equal to the inside diameter of the welded frame, the can end should be lightly butted in an upstream forming step so that the mandrel can be inserted automatically. As can be seen in Fig. 1, two mandrel-like molds 1 and 2, which can be carried out through an opening of mutually opposite scrapers 3 and 4, serve as molds for the can frame 5, the ends of which are slightly conically bent, so that the mandrel ends of the Molds 1 and 2 can be easily inserted. The open frame 5 is arranged in a manner known from the prior art between the wipers 3 and 4 by means of a conveyor, not shown, and is positioned relative to the longitudinal tool axis 6, which is also the longitudinal axis of the frame. In the state shown in FIG. 1, the mandrel-like molds 1 and 2 are in the upper and lower dead positions, respectively.
Wie aus Fig. 2 ersichtlich, werden in Richtung der Pfeile 7 bzw. 8 die Formwerkzeuge 1 und 2 aufeinander zu bewegt, wobei sie die Dosenzarge 5 aufweiten, bis der in Fig. 3 dargestellte Endzustand erreicht ist. Das Profil der Formwerkzeuge hat sich in entsprechender Weise auf die Dosenzarge 5 abgeformt, die in ihrem unteren Drittel eine kehlartige Einschnürung 9 besitzt, die durch die sich verjüngenden Profile der Enden der dornartigen Formwerkzeuge bestimmt ist. Die Stirnseiten der Formwerkzeuge kommen in dem in Fig. 3 dargestellten Endzustand zur Plananlage . Nach der Umformung der Dosenzarge 5 können die Formwerkzeuge 1 und 2 wieder zurückgezogen werden, wobei die geformte Zarge zwischen den Abstreifern 3 und 4 verbleibt und anschließend mit nach dem Stand der Technik bekannten Transportmitteln abgefördert werden kann. Bereits anhand der Fig. 1 bis 3 ist zu erkennen, daß nicht nur das Profilende der Formwerkzeuge, sondern die gesamte Oberflächenkontur an der Zarge 5 abgebildet wird, so daß nicht nur glatte runde Formen entsprechend Fig. 4 oder 5, sondern auch unrunde Formen entsprechend Fig. 6 und 7 sowohl im Shapebereich als auch im Man- telbereich oder längsprofilierte Formen entsprechend Fig. 8 oder auch Dosenformen nach Fig. 9 bzw. Kombinationen aus den vorgenannten Formen hergestellt werden können.As can be seen from FIG. 2, the molds 1 and 2 are moved towards one another in the direction of the arrows 7 and 8, respectively, and they widen the can frame 5 until the final state shown in FIG. 3 is reached. The profile of the molds has been molded in a corresponding manner onto the can frame 5, which has a throat-like constriction 9 in its lower third, which is determined by the tapered profiles of the ends of the mandrel-like molds. The end faces of the molding tools come to face contact in the final state shown in FIG. 3. After the can frame 5 has been formed, the molds 1 and 2 can be withdrawn again, the shaped frame remaining between the wipers 3 and 4 and then being conveyed away using transport means known in the art. 1 to 3 it can be seen that not only the profile end of the molds, but the entire surface contour is shown on the frame 5, so that not only smooth round shapes according to Fig. 4 or 5, but also non-round shapes accordingly 6 and 7 both in the shape area and in the man 8 or longitudinally profiled shapes according to FIG. 8 or can shapes according to FIG. 9 or combinations of the aforementioned shapes can be produced.
Fig. 5 zeigt eine aufgeweitete Zarge 10 mit einem Shape als Schutzsicke 11, die dadurch geformt werden kann, daß das von unten eingeführte Formwerkzeug nahezu bis zum anderen Ende der Zargenöffnung geführt wird und das dornartige Formwerkzeug als Gegenwerkzeug entsprechend kürzer ausgebildet ist. Auch in diesem Fall sind die schließlich zur Anlage kommenden Stirnflächen der aufeinander zu bewegten dornartigen Formwerkzeuge senkrecht zur Längsachse 6 ausgerichtet.Fig. 5 shows a widened frame 10 with a shape as a protective bead 11, which can be formed by the fact that the mold inserted from below is guided almost to the other end of the frame opening and the mandrel-like mold is designed to be correspondingly shorter as a counter tool. In this case too, the end faces of the mandrel-like shaping tools that finally come to rest are aligned perpendicular to the longitudinal axis 6.
In Fig. 6 ist eine aufgeweitete Zarge 12 mit einem asymmetrischen wellenförmigen Dekorations-Shape dargestellt. Die Einschnürung 13 liegt als Ringprofil nicht orthogonal zu der Längsachse 6, sondern schrägwinkelig bzw. sie ist wellenförmig. Dies wird erreicht, indem zwei dornartige Formwerkzeuge mit korrespondierend ausgebildeten Dornenden verwendet werden, deren Stirnfläche in einer schrägwinkelig bzw. wellenförmig zur Längsachse 6 liegenden Ebene bzw. einer schrägwinkelig liegenden, ggf. geschwungenen Fläche angeordnet sind. Da mit den erfindungsgemäßen Formwerkzeugen lediglich Aufweitungen in die Dosenzarge einprägbar sind, also keine Hinterschneidungen, sind die konisch sich verjüngenden Dornenden entsprechend der gewünschten Formgestaltung der Einschnürung und deren Lage auszubilden.6 shows a widened frame 12 with an asymmetrical undulating decorative shape. The constriction 13, as an annular profile, is not orthogonal to the longitudinal axis 6, but rather at an oblique angle or it is undulating. This is achieved by using two mandrel-like shaping tools with correspondingly configured mandrel ends, the end face of which is arranged in a plane lying at an oblique angle or undulating to the longitudinal axis 6 or in an obliquely angled, possibly curved surface. Since only widenings can be impressed into the can frame with the molding tools according to the invention, that is to say no undercuts, the conically tapering mandrel ends are to be designed in accordance with the desired shape of the constriction and its position.
Die in Fig. 7 abgebildete Zarge 14 ist ebenfalls asymmetrisch ausgebildet und besitzt zwei nicht lineare Bereiche 15 und 16, in denen sie sich zu einem kleineren Durchmesser verjüngt, der im dazwischenliegenden Bereich 17 über ein bestimmtes durch die Dornendengestaltung vorgegebenes Längenmaß konstant ist. Generell kann der Shape in Form und Lage dem Druckbild angepaßt sein.The frame 14 shown in FIG. 7 is also asymmetrical and has two non-linear regions 15 and 16, in which it tapers to a smaller diameter, which in the intermediate region 17 extends through a certain one the mandrel end design given length dimension is constant. The shape and position of the shape can generally be adapted to the printed image.
Anhand der Dosenzarge 18 in Fig. 8 sind Kombinationen aus einem rotationssymmetrischen Dekorations-Shape und Längsprofilen 19 zu erkennen, die durch den Formwerkzeugaußenmantel bestimmt werden. Zur Herstellung dieser Dosenzarge können zwei dornartige Formwerkzeuge verwendet werden, deren Stirnflächen innerhalb der Dosenzarge in der Ebene 20 zur Verformungs-Endlage kommen. Neben der Einschnürung 21 kann auch durch entsprechende Ausgestaltung des von unten eingeführten Formwerkzeuges ein durchmesservergrößerter unterer Absatz 22 geschaffen sein, der den gleichen oder einen anderen Durchmesser wie der obere zylindrische Absatz 23 der Zarge sein kann.On the basis of the can frame 18 in FIG. 8, combinations of a rotationally symmetrical decorative shape and longitudinal profiles 19 can be seen, which are determined by the outer shell of the mold. Two mandrel-like shaping tools can be used to produce this can body, the end faces of which come to the final deformation position in plane 20 within the can body. In addition to the constriction 21, a correspondingly enlarged configuration of the molding tool inserted from below can also create a lower shoulder 22 with an enlarged diameter, which can be the same or a different diameter as the upper cylindrical shoulder 23 of the frame.
Die Dosenzarge 24 besitzt einen Außenmantel, der bis auf geringe obere und untere Teilbereiche 25, 26 mit einer Zylinderform jeweils bis zur Ebene 27 reichend, sich verjüngend verläuft, d.h., das Dosenmantelaußenprofil ist weitgehend konkav ausgebildet .The can frame 24 has an outer casing which, with the exception of small upper and lower sections 25, 26 with a cylindrical shape, extends in each case to the plane 27 and tapers, i.e. the can casing outer profile is largely concave.
Fig. 10 zeigt, daß zwei Dosenzargen 5 gemäß Fig. 4 auch stapelbar sind; Entsprechendes gilt auch für die übrigen Dosenzargen.FIG. 10 shows that two can bodies 5 according to FIG. 4 can also be stacked; The same applies to the other can frames.
Das vorbeschriebene Dornaufweitverfahren weist im Vergleich zu dem nach dem Stand der Technik bekannten Spreizen und anderen Verfahren folgende Vorteile auf:The above-described mandrel expansion method has the following advantages over the spreading and other methods known from the prior art:
Die aufgeweitete Zarge ist bei entsprechender Dornausführung - abgesehen von eingeformten Längsprofilen - kreisrund und nicht zwingend vieleckig. Darüber hinaus ist die Dehnung des Bleches über den Umfang gleichmäßig, wodurch eine größere Aufweitung bei gleicher Blechdehnung möglich ist. Es treten keine markanten Höhenschwankungen auf. Die Umformbarkeit ist bis zum Zargenende möglich.The flared frame is circular with a corresponding mandrel design - apart from molded longitudinal profiles - and not necessarily polygonal. In addition, the expansion of the sheet is uniform over the circumference, which allows a larger expansion with the same sheet elongation. There are no striking fluctuations in height. Formability is possible up to the end of the frame.
Weiterhin entsteht eine wünschenswert gleichmäßige Blechdickenreduzierung im zylindrischen Teil, während in dem bela- stungsgefährdeten Shapebereich noch die Originalblechdicke erhalten bleibt.Furthermore, a desirably uniform reduction in sheet thickness occurs in the cylindrical part, while the original sheet thickness is retained in the shape-sensitive area.
Die verwendeten Formwerkzeuge sind einfach, robust und leicht in bestehenden Anlagen nachzurüsten bzw. auszutauschen, wenn geänderte Shapeformen gewünscht werden.The molds used are simple, robust and easy to retrofit or replace in existing systems if changed shape shapes are required.
Die in den Ausführungsbeispielen gemäß Fig. 1 bis 10 dargestellten Shapegestaltungen lassen sich beliebig variieren, wobei Verformungsgrenzen gering sind, abgesehen von der generellen Eignung des Bleches und des Lackes. Wie bereits erwähnt, können lediglich Hinterschnittformen nicht erzeugt werden. The shape designs shown in the exemplary embodiments according to FIGS. 1 to 10 can be varied as desired, with deformation limits being small, apart from the general suitability of the sheet and the lacquer. As already mentioned, only undercut shapes cannot be created.

Claims

Patentansprüche claims
Vorrichtung zum Aufweiten und Formen von Dosenrümpfen (5) mit einem dornartigen Formwerkzeug (1) , das in den aufzuweitenden Dosenrumpf (5) von einer Seite her einführbar ist und einem Gegenwerkzeug (2), d a d u r c h g e k e n n z e i c h n e t, daß das Gegenwerkzeug (2) ebenfalls ein in den Dosenrumpf (5) , jedoch von der gegenüberliegenden Seite her eingeführtes dornartiges Formwerkzeug ist, wobei die Querschnittsprofile der Enden der beiden dornartigen Formwerkzeuge (1, 2) je nach Shapeform gleich oder komplementär gleich sind.Device for expanding and shaping can bodies (5) with a mandrel-like molding tool (1) which can be inserted into the can body to be expanded (5) from one side and a counter tool (2), characterized in that the counter tool (2) is also a the can body (5), however, is a mandrel-like mold inserted from the opposite side, the cross-sectional profiles of the ends of the two mandrel-like molds (1, 2) being identical or complementary, depending on the shape.
Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnittsprofile der beiden dornartigen Formwerkzeuge (1, 2) an deren Ende zumindest in Teilbereichen einen von der Dornlängsachse (6) geringeren Abstand haben als die von dem Dornende weiter abliegenden entsprechenden Teilbereiche.Apparatus according to claim 1, characterized in that the cross-sectional profiles of the two mandrel-like shaping tools (1, 2) have at their end, at least in partial areas, a smaller distance from the longitudinal mandrel axis (6) than the corresponding partial areas further from the mandrel end.
Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dornenden einen maximalen Durchmesser besitzen, der kleiner, gleich oder etwas größer als der Durchmesser des aufzuweitenden Dosenrumpfes (5) ist.Device according to claim 1 or 2, characterized in that the mandrel ends have a maximum diameter which is smaller, equal to or slightly larger than the diameter of the can body (5) to be expanded.
Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Querschnittsformen zum Dornende hin zumindest über einen teilaxialen Bereich sich verjüngend ausgebildet sind. Device according to one of claims 1 to 3, characterized in that the cross-sectional shapes tapering towards the end of the mandrel at least over a partially axial region.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Dornstirnflächen zumindest in Teilbereichen nicht orthogonal zu der Dornlängsachse (6) angeordnet sind.5. Device according to one of claims 1 to 4, characterized in that the mandrel end faces are at least in some areas not orthogonal to the mandrel longitudinal axis (6).
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Dornmantelflächen zumindest teilweise ein von einer Kreiszylinderform abweichendes Profil aufweisen.6. Device according to one of claims 1 to 5, characterized in that the mandrel jacket surfaces at least partially have a profile deviating from a circular cylindrical shape.
7. Vorrichtung zum Aufweiten und Formen von Dosenrümpfen (5) mit einem dornartigen Formwerkzeug (1) , das in den aufzuweitenden Dosenrumpf (5) von einer Seite her einführbar ist und einem Gegenwerkzeug (2) , dadurch gekennzeichnet, daß die Dornmantelflächen zumindest teilweise ein von einer Kreiszylinderform abweichendes Profil aufweisen.7. Device for expanding and shaping can bodies (5) with a mandrel-like mold (1) which can be inserted into the can body to be expanded (5) from one side and a counter tool (2), characterized in that the mandrel jacket surfaces at least partially have a profile deviating from a circular cylindrical shape.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die dornartigen Formwerkzeuge entlang Abstreifern (3, 5) bewegbar sind.8. Device according to one of claims 1 to 7, characterized in that the mandrel-like molds along wipers (3, 5) are movable.
9. Verfahren zum Aufweiten und Formen von Dosenrümpfen (5, 10, 12, 14, 18 und 24), bei dem ein dornartiges Formwerkzeug (1) in den Dosenrumpf eingeführt und gegen ein Gegenwerkzeug (2) bewegt wird, gekennzeichnet durch die Verwendung einer Vorrichtung nach einem der Ansprüche 1 bis 8. 9. A method for expanding and shaping can bodies (5, 10, 12, 14, 18 and 24), in which a mandrel-like molding tool (1) is inserted into the can body and moved against a counter tool (2), characterized by the use of a Device according to one of claims 1 to 8.
EP02779199A 2001-11-16 2002-11-07 Application of a device for expanding and shaping can bodies Expired - Lifetime EP1446248B1 (en)

Applications Claiming Priority (3)

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DE10156085A DE10156085A1 (en) 2001-11-16 2001-11-16 Widening and shaping device has mandrel-like shaping counter-tool with tools having identical or complementary shapes
DE10156085 2001-11-16
PCT/DE2002/004117 WO2003045606A1 (en) 2001-11-16 2002-11-07 Device and method for flaring and shaping can bodies

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EP1446248B1 (en) 2005-12-14
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KR20040058090A (en) 2004-07-03
AU2002342556A1 (en) 2003-06-10
DE50205306D1 (en) 2006-01-19
BR0205838B1 (en) 2010-08-10
JP4567336B2 (en) 2010-10-20
KR100971468B1 (en) 2010-07-22
JP2005510364A (en) 2005-04-21
ATE312673T1 (en) 2005-12-15
US20040011112A1 (en) 2004-01-22
ES2255627T3 (en) 2006-07-01

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